Coupling transformer



FIG. 1 is a front elevational view of the coupling transformer according to the invention;

FIG. 2 is a top plan view of FIG. 1;

FIG. 3 is a left side elevational view of FIG. 1;

FIG. 4 is a right side elevational view of FIG. 1;

FIG. 5 is a bottom plan view of FIG. 1; and

FIG. 6 is a rear elevational view of FIG. 1. 

The ornamental design for the coupling transformer, as shown. 